Statement of the problem

For example, we have 20 tables, each of them has its own set of columns. The problem is that we can make a selection in these tables, with all connections, sortings, filters, etc. Of course, for those who are familiar with IT, it will not be difficult to insert an SQL snippet and run it. However, in this case we had to provide a convenient service for usual users of the resource (network share).
Generally, the interface is pretty simple: we select tables, fields, drag the desired and click ‘Refresh’. Data set results will be shown in the table. If desired, you can save the resulting report or download the data.

How it works

Parameters are transmitted to the server:
  • string fields – the list of fields separated by ‘|’
  • string name – the name of the report
  • int? take – how many records to show
  • int? skip – how many are already shown in the page
Apart from this, we should find out what kind of relationships is shown between the selected fields. For this purpose, we have created a separate table in the database, which stores information about the tables: what type of relation to use, what basic filter is required (for example, show active users only), sorting, etc.
As a result, when appending the customer data with the data about the table in the database, we have a ReportDetail instance, which displays all the information about the field:
[[code]]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[[/code]]

Having gathered together List<ReportDetail>, we pass it to the method, which will build us an SQL query:
[[code]]s:8773:\"string sql = BuildSql (reportDetails.ToList());
private string Buil{[&*&]}dSql (<span class=\\\"hl-keyword\\\">List</span>&lt;ReportDetail&gt; details)
{{[&*&]}
    <span class=\\\"hl-comment\\\">/* declare variables
for working with stri{[&*&]}ngs we use StringBuilder, instead of String, since we need to repeatedly mod{[&*&]}ify the string.   */</span>  
StringBuilder sql = new StringBuilder();
<sp{[&*&]}an class=\\\"hl-keyword\\\">var</span> tables = new <span class=\\\"hl-keyword\\\">L{[&*&]}ist</span>&lt;string&gt;();
StringBuilder select = new StringBuilder();
St{[&*&]}ringBuilder from = new StringBuilder();
StringBuilder where = new StringBui{[&*&]}lder();
StringBuilder defaultFilters = new StringBuilder();
<span class=\\\"{[&*&]}hl-comment\\\">// build select and from sections:</span>
<span class=\\\"hl-key{[&*&]}word\\\">foreach</span> (<span class=\\\"hl-keyword\\\">var</span> detail <span cl{[&*&]}ass=\\\"hl-keyword\\\">in</span> details)
{
<span class=\\\"hl-keyword\\\">var</sp{[&*&]}an> field = detail.FieldName;
<span class=\\\"hl-keyword\\\">var</span> <span c{[&*&]}lass=\\\"hl-keyword\\\">table</span> = detail.TableName;
<span class=\\\"hl-keywo{[&*&]}rd\\\">var</span> filter = detail.Filter;
<span class=\\\"hl-keyword\\\">var</spa{[&*&]}n> joinType = detail.JoinType;
<span class=\\\"hl-keyword\\\">var</span> isLoca{[&*&]}l = crt.IsLocal;
<span class=\\\"hl-keyword\\\">var</span> defaultFilter = crt.{[&*&]}DefaultFilter;
<span class=\\\"hl-keyword\\\">var</span> field = detail.FieldNa{[&*&]}me;
<span class=\\\"hl-keyword\\\">var</span> filter = detail.Filter;
<span cl{[&*&]}ass=\\\"hl-keyword\\\">var</span> rt = detail.ReportTable;
<span class=\\\"hl-key{[&*&]}word\\\">var</span> joinOn = rt.JoinOn;
<span class=\\\"hl-keyword\\\">var</span>{[&*&]} localPrefix = <span class=\\\"hl-string\\\">\\\"@server@.dbo.\\\"</span>;
<span cl{[&*&]}ass=\\\"hl-keyword\\\">var</span> defaultJoinType = rt.DefaultJoinType;
<span c{[&*&]}lass=\\\"hl-keyword\\\">var</span> joinType = joinType ?? defaultJoinType;
<spa{[&*&]}n class=\\\"hl-keyword\\\">var</span> friendlyName = GetFriendlyName(<span class{[&*&]}=\\\"hl-keyword\\\">table</span>, field);
<span class=\\\"hl-keyword\\\">if</span> {[&*&]}(select.Length == 0)
{
    select.<span class=\\\"hl-keyword\\\">Append</span>{[&*&]}(<span class=\\\"hl-built_in\\\">string</span>
          .<span class=\\\"hl-keyw{[&*&]}ord\\\">Format</span>(<span class=\\\"hl-string\\\">\\\"select [{0}].[{1}] AS {2}\\\"<{[&*&]}/span>, <span class=\\\"hl-keyword\\\">table</span>, field, friendlyName))
}
<{[&*&]}span class=\\\"hl-keyword\\\">else</span>
{
    select.<span class=\\\"hl-keywor{[&*&]}d\\\">Append</span>(<span class=\\\"hl-string\\\">\\\",[\\\"</span>).<span class=\\\"hl-{[&*&]}keyword\\\">Append</span>(<span class=\\\"hl-keyword\\\">table</span>).<span class{[&*&]}=\\\"hl-keyword\\\">Append</span>(<span class=\\\"hl-string\\\">\\\"].[\\\"</span>)
   {[&*&]}       .<span class=\\\"hl-keyword\\\">Append</span>(field).<span class=\\\"hl-key{[&*&]}word\\\">Append</span>(<span class=\\\"hl-string\\\">\\\"] AS \\\"</span>).<span class{[&*&]}=\\\"hl-keyword\\\">Append</span>(friendlyName);
}
<span class=\\\"hl-keyword\\\">{[&*&]}if</span> (!tables.Contains(<span class=\\\"hl-keyword\\\">table</span>))
{
<s{[&*&]}pan class=\\\"hl-comment\\\">// default filters</span>
      <span class=\\\"hl-k{[&*&]}eyword\\\">if</span> (!string.IsNullOrEmpty(defaultFilter))
     {
         {[&*&]}<span class=\\\"hl-keyword\\\">if</span> (defaultFilters.Length == 0)
         {[&*&]}{
             defaultFilters = defaultFilters.<span class=\\\"hl-keyword\\\">A{[&*&]}ppend</span>((\\\")  
                             .<span class=\\\"hl-keyword\\{[&*&]}\">Append</span>(defaultFilter).<span class=\\\"hl-keyword\\\">Append</span>(<spa{[&*&]}n class=\\\"hl-string\\\">\\\")\\\"</span>);
         }
         <span class=\\\"hl-{[&*&]}keyword\\\">else</span>
         {
             defaultFilters.<span class=\\{[&*&]}\"hl-keyword\\\">Append</span>(<span class=\\\"hl-string\\\">\\\" and (\\\"</span>).<sp{[&*&]}an class=\\\"hl-keyword\\\">Append</span>(defaultFilter).<span class=\\\"hl-keywor{[&*&]}d\\\">Append</span>(<span class=\\\"hl-string\\\">\\\")\\\"</span>);
         }
    {[&*&]} }
     <span class=\\\"hl-keyword\\\">if</span> (from.Length == 0)
     {
  {[&*&]}          from = from.<span class=\\\"hl-keyword\\\">Clear</span>().<span class={[&*&]}\\\"hl-keyword\\\">Append</span>(<span class=\\\"hl-string\\\">\\\"from \\\"</span>).<sp{[&*&]}an class=\\\"hl-keyword\\\">Append</span>(localPrefix)
                        {[&*&]}      .<span class=\\\"hl-keyword\\\">Append</span>(<span class=\\\"hl-string\\\">\\\"{[&*&]}[\\\"</span>) .<span class=\\\"hl-keyword\\\">Append</span>(<span class=\\\"hl-keywo{[&*&]}rd\\\">table</span>).<span class=\\\"hl-keyword\\\">Append</span>(<span class=\\\"hl{[&*&]}-string\\\">\\\"]\\\"</span>);
     }
     <span class=\\\"hl-keyword\\\">else</span{[&*&]}>
     {
            from.<span class=\\\"hl-keyword\\\">Append</span>(<span c{[&*&]}lass=\\\"hl-string\\\">\\\" \\\"</span>).<span class=\\\"hl-keyword\\\">Append</span>(jo{[&*&]}inType)) .<span class=\\\"hl-keyword\\\">Append</span>(<span class=\\\"hl-string\\\"{[&*&]}>\\\" join \\\"</span>)             
                .<span class=\\\"hl-keyword\\{[&*&]}\">Append</span>(localPrefix).<span class=\\\"hl-keyword\\\">Append</span>(<span {[&*&]}class=\\\"hl-string\\\">\\\"[\\\"</span>).<span class=\\\"hl-keyword\\\">Append</span>(<{[&*&]}span class=\\\"hl-keyword\\\">table</span>)
                .<span class=\\\"hl-k{[&*&]}eyword\\\">Append</span>(<span class=\\\"hl-string\\\">\\\"] on \\\"</span>).<span cla{[&*&]}ss=\\\"hl-keyword\\\">Append</span>(joinOn);
     }
}
     <span class=\\\"hl-k{[&*&]}eyword\\\">if</span> (!tables.Contains(<span class=\\\"hl-keyword\\\">table</span>{[&*&]}))
     {
         tables.Add(<span class=\\\"hl-keyword\\\">table</span>);
 {[&*&]}    }
}
<span class=\\\"hl-comment\\\">//add filters to the where section</spa{[&*&]}n>
int clauseCount = details.Where(x =&gt; !string.IsNullOrEmpty(x.Filter)){[&*&]}.<span class=\\\"hl-keyword\\\">Count</span>();
int <span class=\\\"hl-keyword\\\">{[&*&]}order</span> = 1;
<span class=\\\"hl-keyword\\\">foreach</span> (<span class=\\\"{[&*&]}hl-keyword\\\">var</span> detail <span class=\\\"hl-keyword\\\">in</span> details.{[&*&]}Where(x =&gt; !string.IsNullOrEmpty(x.Filter)).ToList())
{
<span class=\\\"h{[&*&]}l-keyword\\\">if</span> (where.Length == 0)
     {
            where = where{[&*&]}.<span class=\\\"hl-keyword\\\">Clear</span>().<span class=\\\"hl-keyword\\\">Append{[&*&]}</span>(<span class=\\\"hl-string\\\">\\\"(\\\"</span> + detail.Filter + <span class{[&*&]}=\\\"hl-string\\\">\\\")\\\"</span>)
                         .<span class=\\\"hl-key{[&*&]}word\\\">Append</span>((clauseCount != <span class=\\\"hl-keyword\\\">order</span>{[&*&]} ? <span class=\\\"hl-string\\\">\\\" AND\\\"</span> : <span class=\\\"hl-string\\\">\\\"\\{[&*&]}\"</span>) + <span class=\\\"hl-string\\\">\\\" \\\"</span>);
     }
     <span cla{[&*&]}ss=\\\"hl-keyword\\\">else</span>
     {
         where.<span class=\\\"hl-keywo{[&*&]}rd\\\">Append</span>(<span class=\\\"hl-string\\\">\\\"(\\\"</span> + detail.Filter + {[&*&]}<span class=\\\"hl-string\\\">\\\")\\\"</span>)
         .<span class=\\\"hl-keyword\\{[&*&]}\">Append</span>((clauseCount != <span class=\\\"hl-keyword\\\">order</span> ? <s{[&*&]}pan class=\\\"hl-string\\\">\\\" AND\\\"</span> : <span class=\\\"hl-string\\\">\\\"\\\"</sp{[&*&]}an>) + <span class=\\\"hl-string\\\">\\\" \\\"</span>);
     }
     <span class=\\\"{[&*&]}hl-keyword\\\">order</span>++;
}
<span class=\\\"hl-keyword\\\">var</span> subWh{[&*&]}ere = where.<span class=\\\"hl-keyword\\\">ToString</span>();
where.<span class{[&*&]}=\\\"hl-keyword\\\">Clear</span>().<span class=\\\"hl-keyword\\\">Append</span>(<spa{[&*&]}n class=\\\"hl-string\\\">\\\" nwhere \\\"</span>)
       .<span class=\\\"hl-keyword{[&*&]}\\\">Append</span>((subWhere.<span class=\\\"hl-keyword\\\">ToString</span>() != <{[&*&]}span class=\\\"hl-string\\\">\\\"\\\"</span> ? subWhere.<span class=\\\"hl-keyword\\\">T{[&*&]}oString</span>() : <span class=\\\"hl-string\\\">\\\"\\\"</span>))
       .<span cl{[&*&]}ass=\\\"hl-keyword\\\">Append</span>((defaultFilters
       .<span class=\\\"hl-k{[&*&]}eyword\\\">ToString</span>() != <span class=\\\"hl-string\\\">\\\"\\\"</span> ? (subWh{[&*&]}ere.<span class=\\\"hl-keyword\\\">ToString</span>() != <span class=\\\"hl-string\\{[&*&]}\">\\\"\\\"</span> ? <span class=\\\"hl-string\\\">\\\" and \\\"</span> : <span class=\\\"h{[&*&]}l-string\\\">\\\"\\\"</span>) + defaultFilters.<span class=\\\"hl-keyword\\\">ToString{[&*&]}</span>() : <span class=\\\"hl-string\\\">\\\"\\\"</span>));
<span class=\\\"hl-comme{[&*&]}nt\\\">// append the query string</span>
sql = select.CopyTo(sql).<span class{[&*&]}=\\\"hl-keyword\\\">Append</span>(<span class=\\\"hl-string\\\">\\\"n\\\"</span>).<span {[&*&]}class=\\\"hl-keyword\\\">Append</span>(from)
            .<span class=\\\"hl-keyw{[&*&]}ord\\\">Append</span>(<span class=\\\"hl-string\\\">\\\"n\\\"</span>).<span class=\\\"hl{[&*&]}-keyword\\\">Append</span>(where).<span class=\\\"hl-keyword\\\">Append</span>(<sp{[&*&]}an class=\\\"hl-string\\\">\\\"n\\\"</span>).<span class=\\\"hl-keyword\\\">Append</span{[&*&]}>(<span class=\\\"hl-string\\\">\\\"n\\\"</span>);
<span class=\\\"hl-keyword\\\">retur{[&*&]}n</span> sql.<span class=\\\"hl-keyword\\\">ToString</span>();
}
<span class=\\{[&*&]}\"hl-keyword\\\">As</span> a result, we got a ready SQL <span class=\\\"hl-keywor{[&*&]}d\\\">query</span> code. It remains only to <span class=\\\"hl-keyword\\\">run</sp{[&*&]}an> it and get a data <span class=\\\"hl-keyword\\\">set</span>:
using (<span c{[&*&]}lass=\\\"hl-keyword\\\">var</span> connection = new SqlConnection(connectionStri{[&*&]}ng))
{
    <span class=\\\"hl-keyword\\\">var</span> dataSet = new DataSet();{[&*&]}
    <span class=\\\"hl-keyword\\\">var</span> dataAdapter = new SqlDataAdapter({[&*&]}sql, connection);
    dataAdapter.Fill(dataSet);
    <span class=\\\"hl-keyw{[&*&]}ord\\\">return</span> dataSet.Tables[0];
}\";{[&*&]}[[/code]]

Per page loading and unloading of the number of all entries.
To implement this part, we will use the previously created SQL code, simply by wrapping it in the additional code.
For example, let’s create a query string to obtain the number of all entries:
[[code]]czoxNjI6XCI8c3BhbiBjbGFzcz1cXFwiaGwtYXR0cmlidXRlXFxcIj52YXIgY291bnRRdWVyeTwvc3Bhbj4gPSA8c3BhbiBjbGFzcz1cXFwiaGx7WyYqJl19LXN0cmluZ1xcXCI+XFxcInNlbGVjdCBjb3VudCgxKSBmcm9tIChcXFwiPC9zcGFuPisgc3FsICs8c3BhbiBjbGFzcz1cXFwiaGwtc3RyaW5nXFxcIj57WyYqJl19XFxcIikgc3ViXFxcIjwvc3Bhbj47XCI7e1smKiZdfQ==[[/code]]

Per page loading is implemented in much the same:
[[code]]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[[/code]]